Mihkel Põder

Circle.java

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+import java.lang.Math;
+
+public class Circle {
+	double a;
+	public Circle(double radius) {
+		if (radius <= 0) {throw new RuntimeException("Radius cannot be smaller than 0");}
+		a = radius;
+	}
+
+	public double area() {
+		return Math.round(3.14 * a * a);
+	}
+
+	public double circumference() {
+		return Math.round(2 * 3.14 * a);
+	}
+
+	public String toString() {
+		return "Circle with radius of " + a + " has the area of "
+		+ area() + " and the circumference of " + circumference() + " units.";
+	}
+
+}

circleTest.java

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+public class circleTest {
+	public static void main(String[] args) {
+		Circle table1 = new Circle(145);
+		Circle wheel = new Circle(40);
+		Circle glass = new Circle(2.4);
+		System.out.println(table1.area() + " " + table1.circumference());
+		System.out.println(wheel.area());
+		System.out.println(glass.area());
+		System.out.println(table1);
+		System.out.println(wheel.toString());
+	}
+}